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Control apparatus for a switched reluctance motor

a control apparatus and reluctance motor technology, applied in the direction of electrical equipment, control systems, electronic commutators, etc., can solve the problems of insufficient effect of apparatus distortion of interlinkage magnetic flux waveform of coil, and many harmonic components, so as to reduce harmonic core losses and noise of sr motor, moderate changes in the flux linkage of coil, and the effect of reducing harmonic core losses and nois

Active Publication Date: 2014-08-28
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about reducing harmonic core losses and noise in a SR motor by controlling the flux linkage of the coil through gradual changes in the applied voltage. By controlling the flux linkage indirectly through modest changes in the coil's flux linkage, harmonic core losses and noise can be minimized. The technical effect is improved performance of the SR motor.

Problems solved by technology

This will cause an interlinkage magnetic flux waveform of the coil to be distorted and to include many harmonic components.
There may therefore be concern that the effect of the apparatus to reduce the harmonic core losses and noise of the SR motor is not exhibited sufficiently.

Method used

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  • Control apparatus for a switched reluctance motor
  • Control apparatus for a switched reluctance motor
  • Control apparatus for a switched reluctance motor

Examples

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Effect test

first embodiment

[0060]A control apparatus for a switched reluctance (SR) motor as a vehicle prime mover in accordance with a first embodiment of the present invention will be described more fully hereinafter with reference to the accompanying drawings.

[0061]As shown in FIG. 1, a high-voltage battery 10, as a DC power supply, is a secondary battery having a terminal voltage of 100V or more (e.g., 288V), such as a lithium-ion secondary battery, a nickel-metal-hydride secondary battery or the like.

[0062]The high-voltage battery 10 is electrically connected to a power conversion circuit 20 via a smoothing capacitor 12. The power conversion circuit 20 is electrically connected to a vehicle-mounted motor generator as a vehicle prime mover. The motor generator is a SR motor. More specifically, in the present embodiment, a three-phase SR motor having a U-phase coil 22u, a V-phase coil 22v and a W-phase coil 22w is used as the SR motor. The power conversion circuit 20 includes a series connection of a U-pha...

second embodiment

[0110]There will now be explained a second embodiment of the present invention. Only differences of the second embodiment from the first embodiment will be explained.

[0111]In the present embodiment, as shown in FIG. 13B, a region where the voltage control process described above is performed is limited with respect to the command torque Trq* and the electrical angular speed ω that is a rotation speed of the rotor of the SR motor. In FIG. 13B, the maximum torque is denoted by Tmax.

[0112]FIG. 14 shows a flowchart of a process of limiting a region where the voltage control process is performed. This process is performed in the control apparatus 30 repeatedly every predetermined time interval.

[0113]First, in step S30, it is determined whether the command torque Trq* is equal to or less than a prescribed torque Tβ and the electrical angular speed ω is equal to or less than a prescribed speed ωβ.

[0114]If it is determined in step S30 that the command torque Trq* is equal to or less than th...

third embodiment

[0123]There will now be explained a third embodiment of the present invention. Only differences of the third embodiment from the first embodiment will be explained.

[0124]In the present embodiment, a modulation signal αε is generated so as to compensate for a voltage drop due to the presence of a resistance r of the coil 22ε. FIG. 15 shows an example of a voltage drop caused by the presence of a resistance r of the U-phase a coil 22u.

[0125]FIG. 16 shows a flowchart of a process of generating the modulation signal in accordance with the present embodiment. This process is performed in the operation signal generator 30c of the control apparatus 30 repeatedly every predetermined time interval.

[0126]In FIG. 16, the same operations as in FIG. 5 are assigned the same numbers.

[0127]First, in step S10a, in addition to the command torque Trq*, the electrical angle θe and the electrical angular speed ω, an ε-phase detected current iεr and a DC voltage Vdc detected by the voltage sensor 34 are...

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Abstract

An apparatus for controlling a switched reluctance motor with use of a power conversion circuit. In the apparatus, a command voltage setter sets a command voltage for a coil of the motor, where the command voltage is set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage. A voltage controller controls an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based on and claims the benefit of priority from earlier Japanese Patent Application No. 2013-39959 filed Feb. 28, 2013 and earlier Japanese Patent Application No. 2013-218851 filed Oct. 22, 2013, the description of which is incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a control apparatus for a switched reluctance motor.[0004]2. Related Art[0005]A known control apparatus for a switched reluctance (SR) motor, as disclosed in Japanese Patent No. 3255167, controls a current flowing through a coil of the SR motor to a command current with use of a hysteresis comparator. More specifically, this apparatus uses a positive direct-current voltage (VDC), a zero voltage and a negative direct-current voltage (−VDC) to be applied to the coil of the SR motor. This is intended to reduce a switching frequency and the ripple in the current flowing through the coil and thereby ...

Claims

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Application Information

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IPC IPC(8): H02P6/14H02P25/08
CPCH02P6/14H02P25/092
Inventor KAMADA, YOSHINOBU
Owner DENSO CORP
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